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The Multi-Filter Rotating Shadowband Radiometer
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The
Yankee Environmental Systems seven channel Multi-Filter Rotating Shadow-Band Radiometer(MFRSR) uses 6 independent interference filter
photodiode detector combinations to make total horizontal solar irradiance measurements at 415, 500, 610, 665, 862 and 940 nm (nominal 10
nm FWHM
bandwidth) through a single Lambertian detector. The seventh channel is an unfiltered broadband silicon diode detector. A
computer-controlled, automatic
rotating shadow band permits the near simultaneous determination of total horizontal, direct normal and diffuse radiation at each filtered
wavelength. The
wavelengths (except the 940 nm water-vapor band) were chosen to permit a Langley analysis for the direct determination of optical depth.
Measurements are
made sequentially at each wavelength every 15 seconds and integrated into 3-minute averages by an on-board computer. The computer also
serves as a data
logger for ancillary instrumentation that is connected to it. The MFRSR is polled daily via a dedicated telephone line.
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- Plan (SOP)
- Representativeness
- Bias
- Precision
- Comparability
- References
Harrison, L., J. Michalsky, J. Bernt, Automated multi-filter rotating
shadow-band radiometer: an instrument for optical depth and radiation
measurements, Appl. Opt., 33(22) 1994.
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